linux-kernel - Re: [PATCH v3] cpuidle: big.LITTLE: add of_node

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Date:   Mon, 10 Dec 2018 12:59:24 +0100
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Yangtao Li <tiny.windzz@...il.com>, rjw@...ysocki.net,
        lorenzo.pieralisi@....com
Cc:     linux-pm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] cpuidle: big.LITTLE: add of_node_put()


Hi Yangtao,


On 20/11/2018 17:14, Yangtao Li wrote:
> of_find_node_by_path() acquires a reference to the node
> returned by it and that reference needs to be dropped by its caller.
> bl_idle_init() doesn't do that, so fix it.
> 
> Signed-off-by: Yangtao Li <tiny.windzz@...il.com>
> ---
> Changes in v3:
> -update changelog
> ---
>  drivers/cpuidle/cpuidle-big_little.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/cpuidle/cpuidle-big_little.c b/drivers/cpuidle/cpuidle-big_little.c
> index db2ede565f1a..650f063ef809 100644
> --- a/drivers/cpuidle/cpuidle-big_little.c
> +++ b/drivers/cpuidle/cpuidle-big_little.c
> @@ -174,8 +174,12 @@ static int __init bl_idle_init(void)
>  	/*
>  	 * Initialize the driver just for a compliant set of machines
>  	 */
> -	if (!of_match_node(compatible_machine_match, root))
> +	if (!of_match_node(compatible_machine_match, root)){
> +		of_node_put(root);
>  		return -ENODEV;
> +	}
> +
> +	of_node_put(root);

Don't duplicate the of_node_put.

I suggest:

const struct of_device_id *match_id;

[ ... ]


match_id = of_match_node(compatible_machine_match, root);

of_node_put(root);

if (!match_id)
	return -ENODEV;


>  	if (!mcpm_is_available())
>  		return -EUNATCH;
> 


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